How to get first and last element in an array in java?

JavaArrays

Java Problem Overview

If I have an array of doubles:

[10.2, 20, 11.1, 21, 31, 12, 22.5, 32, 42, 13.6, 23, 32, 43.3, 53, 14, 24, 34, 44, 54, 64, 15.1, 25, 35, 45, 55, 65.3, 75.4, 16, 26, 17.5,]

and I want to get the first element and last element so that

firstNum = 10.2

lastNum = 17.5

how would I do this?

Java Solutions

Solution 1 - Java

If you have a double array named numbers, you can use:

firstNum = numbers[0];
lastNum = numbers[numbers.length-1];

or with ArrayList

firstNum = numbers.get(0);
lastNum = numbers.get(numbers.size() - 1);

Solution 2 - Java

Getting first and last elements in an array in Java

int[] a = new int[]{1, 8, 5, 9, 4};

First Element: a[0]

Last Element: a[a.length-1]

Solution 3 - Java

// Array of doubles
double[] array_doubles = {2.5, 6.2, 8.2, 4846.354, 9.6};

// First position
double firstNum = array_doubles[0]; // 2.5

// Last position
double lastNum = array_doubles[array_doubles.length - 1]; // 9.6

This is the same in any array.

Solution 4 - Java

Check this

double[] myarray = ...;
System.out.println(myarray[myarray.length-1]); //last
System.out.println(myarray[0]); //first

Solution 5 - Java

I think there is only one intuitive solution and it is:

int[] someArray = {1,2,3,4,5};
int first = someArray[0];
int last = someArray[someArray.length - 1];
System.out.println("First: " + first + "\n" + "Last: " + last);

Output:

First: 1
Last: 5

Solution 6 - Java

This is the given array.

    int myIntegerNumbers[] = {1,2,3,4,5,6,7,8,9,10};

// If you want print the last element in the array.

    int lastNumerOfArray= myIntegerNumbers[9];
    Log.i("MyTag", lastNumerOfArray + "");

// If you want to print the number of element in the array.

    Log.i("MyTag", "The number of elements inside" +
            "the array " +myIntegerNumbers.length);

// Second method to print the last element inside the array.

    Log.i("MyTag", "The last elements inside " +
            "the array " + myIntegerNumbers[myIntegerNumbers.length-1]);

Solution 7 - Java

getting first and last element in an array in java

double[] numbers = {10.2, 20, 11.1, 21, 31, 12, 
22.5, 32, 42, 13.6, 23, 32, 43.3, 53, 14, 24, 34,
44, 54, 64, 15.1, 25, 35, 45, 55, 65.3, 75.4, 16, 26, 17.5,};


double firstNumber= numbers[0];

double lastNumber = numbers[numbers.length-1];

System.out.println("firstNum = "+ firstNumber);

System.out.println("lastNum = "+ lastNumber);
Categories
Recommended Java Solutions
Recommended Arrays Solutions

Previous Solution:

Disable wrapping in Psql output

BashPostgresqlPsql

Next Solution:

conda command will prompt error: "Bad Interpreter: No such file or directory"

PythonLinuxAnaconda

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionJotaroView Question on Stackoverflow
Solution 1 - JavaK RichardsonView Answer on Stackoverflow
Solution 2 - JavaYagmur SAHINView Answer on Stackoverflow
Solution 3 - JavaXavCo7View Answer on Stackoverflow
Solution 4 - Javafsalazar_schView Answer on Stackoverflow
Solution 5 - JavaAlexander GrassView Answer on Stackoverflow
Solution 6 - JavaTEJVEER SINGHView Answer on Stackoverflow
Solution 7 - JavaSerhat TureView Answer on Stackoverflow